Hi,
the following vimscript gives me an error on plain vim72 with no
patches applied:

let mdict = {"name": "vimwiki", "data":[]}
for [key, value] in items(mdict)
  " echo key value
endfor

E706: Variable type mismatch for: value.

:h E706 gives some explanation -- it looks like there is "change the
type of a variable" from string to a list.

So, it looks like for loop cannot iterate over composite data.
Just tried:

let lst = ["hello", []]
for value in lst
endfor

Gives me the same error.
I'd expect it to do :unlet key, :unlet value before each iteration.
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